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Vertical Venting
The vent pipes must be connected to the proper collars on the unit and
the exhaust vent pipe must be connected to the termination cap or the
unit will not operate.
The combustion air intake pipe can be connected to the termination cap
(see Figure 7b) or it can terminate inside the chimney (see Figure 7a).
If combustion air intake pipe is terminated inside the chimney and not
connected to the actual termination cap the bottom opening of the chim-
ney (chimney throat) must be sealed around the vent pipes. Use a non
combustible seal-off plate (i.e. 22 gage sheet steel) or unfaced fiberglass
insulation (8 lb per square foot density minimum) to seal around the vent
pipes. Whichever "seal off" method is used must effectively seal the area
to prevent room air passage to the chimney of the fireplace. The insulation
may give off an odor during the first hour of operation.
NOTE: Terminating the air intake liner as shown here may not be al-
lowed by some local codes. Check with the authority having jurisdiction
for your area.
Exhaust 3" (75mm) UL
1777. A full length liner
is required from the
exhaust outlet on appli-
ance to center collar of
termination cap.
Air Inlet Liner (for combustion air) When
terminating the air inlet liner at this point, a
positive flue connection is required (to ensure
combustion air is drawn down the chimney
only).
Masonry and Factory Built Fireplaces
Figure 7a - Terminating Air Inlet in Chimney
NOTE: The minimum vertical rise (exhaust vent) is 10 feet (3.1 M) and
the maximum vertical rise is 35 feet (10.7 M). These dimensions are
measured from the starting collars of the unit to the end of the vent pipe.
The fireplace and fireplace chimney must be clean and in good working
order and constructed of non-combustible materials. Inspect chimney
cleanouts for proper fit and seal.
12
The outside air inlet does not
require a full reline (if intake
liner is terminated in chimney
and a positive flue connection
is achieved as specified).
Existing Fireplace Flue
(chimney)
Positive Flue Con-
nection (sealing
fireplace throat
using a noncombus-
tible seal-off plate
or insulation).
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
The existing fireplace chimneys
may take various contours
which the flexible liners will
accommodate. However, keep
the flexible liner as STRAIGHT
as possible, avoid unnecessary
bending.
Liner Requirements:
Use 3" (76 mm) diameter listed gas
vent liner (UL1777 ONLY) for the
EXHAUST
Use 3" (76 mm) diameter listed
liner (UL 181 or UL1777) for the
AIR INTAKE.
Vertical Height Min. = 10 ft. (3.1 M)
Vertical height Max. = 35 ft. (10.7 M)
Note: Measured from flue collar on
unit to the end of the vent pipe or liner
The flexible vent pipe
must NOT be allowed to
sag behind insert or in
fireplace flue.
Figure 7b
Make sure that both liners will pass through existing damper area.
Remove or lock damper to allow the passage of the flexible liners. If
the damper will not allow the passage of both liners, DO NOT PROCEED
FURTHER. (If fireplace is masonry) Consult a local mason for removal
of the damper without risk of structural damage or leakage (if the fire-
place is factory built) TheappliancemayNOTbeinstalledintothefireplace.
WARNING
Direct-Vent Fireplace Insert Vent Requirements - Use liner
listed to UL181 (Factory-made Air Ducts And Air Connec-
tors) or UL1777 (Chimney Liners) for the AIR INTAKE. Use
liner listed to UL1777 ONLY for the EXHAUST.
Do not substitute the heat-rated flex liner (UL1777) for
the exhaust with any other type liner or a fire may result
causing property damage, personal injury or loss of life.
Vertical Cap
Termination
Connector
Exhaust
Intake
Combustion Air Intake
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